<template>
<div>
  <!-- 面包屑导航区域 -->
  <el-breadcrumb separator-class="el-icon-arrow-right">
    <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
    <el-breadcrumb-item>权限管理</el-breadcrumb-item>
    <el-breadcrumb-item>角色列表</el-breadcrumb-item>
  </el-breadcrumb>

  <!-- 卡片视图区域 -->
  <el-card >
  <!-- 添加角色按钮区域 -->
    <el-row>
      <el-col>
        <el-button type="primary">添加角色</el-button>
      </el-col>
    </el-row>

    <!-- 角色列表区域 -->
    <el-table :data="rolesList" border stripe>
      <!--  展开列    -->
      <el-table-column type="expand">
        <template slot-scope="scope">
          <el-row :class="['bdbottom',i1 === 0 ? 'bdtop': '','vcenter']"
                  v-for="(item1,i1) in scope.row.children"
                  :key="item1.id">
            <!--  渲染一级权限    -->
            <el-col :span="5">
              <el-tag
                  closable @close="removeRightById(scope.row, item1.id)">
                {{item1.authName}}
              </el-tag>
              <i class="el-icon-caret-right"></i>
            </el-col>
            <!--  渲染二级和三级权限    -->
            <el-col :span="19">
              <!--  通过 for 循环 嵌套渲染二级权限   -->
              <el-row :class="[i2 === 0 ? '' : 'bdtop','vcenter']" v-for="(item2, i2) in item1.children" :key="item2.id">
                <el-col :span="6">
                  <el-tag type="success"
                          closable @close="removeRightById(scope.row, item2.id)">
                    {{item2.authName}}
                  </el-tag>
                  <i class="el-icon-caret-right"></i>
                </el-col>
                <el-col :span="18" >
                  <el-tag type="warning"
                          v-for="(item3, i2) in item2.children"
                          :key="item3.id" closable @close="removeRightById(scope.row, item3.id)">
                    {{item3.authName}}
                  </el-tag>
                </el-col>
              </el-row>
            </el-col>
          </el-row>
<!--          <pre>{{scope.row}}</pre>  //遍历里边的内容-->
        </template>

      </el-table-column>
      <!--  索引列    -->
      <el-table-column label="#" type="index"></el-table-column>
      <el-table-column label="角色名称" prop="roleName">

      </el-table-column>
      <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
      <el-table-column label="操作"  width="300px">
        <template slot-scope="scope">
          <!--   修改按钮  -->
          <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
          <!--   删除按钮  -->
          <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
          <!--   分配权限按钮  -->
          <el-button type="warning" icon="el-icon-setting" size="mini"
          @click="showSetRightDialog(scope.row)">分配权限</el-button>
        </template>
      </el-table-column>
    </el-table>
  </el-card>

  <!-- 分配权限对话框 -->
  <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisible"
      width="50%" @close="setRightDialogClosed()">
  <!--  树形控件  -->
    <el-tree :data="rightsList" :props="treeProps" show-checkbox
             node-key="id" default-expand-all
             :default-checked-keys="defKeys" ref="treeRef"></el-tree>
    <span slot="footer" class="dialog-footer">
    <el-button @click="setRightDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="allotRights()">确 定</el-button>
  </span>
  </el-dialog>
</div>
</template>

<script>
export default {
  name: "Roles",
  data() {
    return {
      // 所有角色列表数据
      rolesList: [],
      // 控制分配权限对话框的显示与隐藏
      setRightDialogVisible: false,
      // 所有权限列表数据
      rightsList:[],
      // 树形控件的属性绑定对象
      treeProps: {
        label: 'authName',      // label: 看到哪个属性绑定的值
        children: 'children'    // children: 父子节点通过哪个属性来实现嵌套的
      },

      // 默认选中的节点Id值数组
      defKeys:[],

      // 当前即将被分配权限角色的id
      roleId: ''
    }
  },

  created() {
    // 获取所有角色列表
    this.getRolesList()
  },

  methods: {
    // 获取所有角色列表的方法
    async getRolesList() {
      const {data: res} = await this.$http.get('roles')
      if (res.meta.status !== 200){
        return this.$message.error('获取角色列表失败')
      }this.rolesList = res.data
      console.log(this.rolesList);
    },

    // 根据id删除对应的权限
    async removeRightById(role, rightId) {
      // 弹框提示用户是否要删除
      const confirmResult = await this.$confirm('此操作将永久删除该权限, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning',
      }).catch(err => err)

      if (confirmResult !== 'confirm'){
        return this.$message.info('已取消删除')
      }

      const {data: res} = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
      if (res.meta.status !== 200){
        return this.$message.error('删除权限失败')
      }
      // await this.getRolesList()  // 避免删除后重新渲染角色列表数据，关闭展开行
      role.children = res.data    // 这样写，展开行不会自动关闭
    },

    // 展示分配权限对话框
    async showSetRightDialog(role) {

      this.roleId = role.id

      // 获取所有权限数据
      const {data: res} = await this.$http.get('rights/tree')
      if (res.meta.status !== 200){
        return this.$message.error('获取权限数据失败')
      }

      // 把获取的权限数据保存到 data 中
      this.rightsList = res.data
      console.log(this.rightsList);

      // 递归获取三级节点的id
      this.getLeafKeys(role,this.defKeys)

      this.setRightDialogVisible = true
    },

    // 通过递归的形式，获取角色下所有三级权限的id，并保存到 defKeys 数组中
    getLeafKeys(node, arr) {
    // 如果当前 node 节点不包含children 属性，则是三级节点
      if (!node.children) {
        return arr.push(node.id)
      }else{
          node.children.forEach(item =>
          this.getLeafKeys(item, arr))
      }
    },

    // 监听权限对话框重置清空defKeys事件，也可以在递归之前将this.getLeafKeys(role,this.defKeys=[])
    setRightDialogClosed() {
      this.defKeys = []
    },

    // 点击为角色分配权限
    async allotRights() {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]

      const idStr = keys.join(',')

      const {data: res} = await this.$http.post
      (`roles/${this.roleId}/rights`, {rids: idStr})

      if (res.meta.status !== 200){
        return this.$message.error('分配权限失败')
      }this.$message.success('分配权限成功')

      await this.getRolesList()
      this.setRightDialogVisible = false
    }
  }
}
</script>

<style lang="less" scoped>
.el-tag{
  margin: 7px;
}

.bdtop {
  border-top: 1px solid #eee;
}
.bdbottom {
  border-bottom: 1px solid #eee;
}

//纵向列表中的item居中显示
.vcenter {
  display: flex;
  align-items: center;
}
</style>